Many doctors and the World Health Organization recommend breastfeeding exclusively for the first six months of a baby's life. But for some new mothers, that's not possible, so they're getting it online.

Researchers are now adding bacteria to the list, and they found even small amounts of bad milk can cause big problems.

There's a reason maternity wards call it "liquid gold." Most experts said breast milk offers the best nutrition for a newborn, but some mothers can't produce their own and others have an extra supply.

There's a growing trend of "milk-sharing websites" that cater to women to buy, to sell or to donate breast milk. But a study published Monday in the journal Pediatrics found most breast milk bought online is contaminated.

"It's buyer beware, and you want to make sure you don't give your baby something that is going to harm him," said Dr. Melinda Elliot, a neonatologist at the Children's Hospital at Sinai, who was not involved in the research. "If you buy that milk online, you have no idea where it has been, where it came from, the status of the mother or what kind of organisms might be present in the milk."

Most of it contains a dangerous list of extra ingredients, according to investigators at Nationwide Children's Hospital in Ohio. Researchers bought 101 samples of breast milk anonymously from the Internet, analyzed it in the lab and found three-fourths of it was contaminated.

French Foreign Minister Laurent Fabius has informed the Iranian delegation at talks in Switzerland on Iran's nuclear program that he will return to Paris at dawn Wednesday in an apparent effort to force t...